Pests
Tetranychus urticae
The spider mite is an arachnid that damages plants by sucking out cell sap and chlorophyll. The damage manifests as yellowing, curling, and drying of leaves, which leads to a significant reduction in yield.
Mentioned in descriptions 1 326 varieties reference book.
The spider mite is a dangerous pest that pierces the leaf epidermis and sucks out cell sap, leading to the destruction of chloroplasts and the inhibition of photosynthesis. Initial signs of infestation include the appearance of small light spots on the upper side of the leaf. In advanced cases, a fine web and colonies of the pest are found on the underside of the leaf, and the plant itself turns yellow, dries up, and can lose up to 60% of its yield.
The rate of reproduction and the degree of damage directly depend on temperature and humidity: at +25...+30°C and humidity below 60%, the pest's development cycle shortens to 5–7 days. A favorable factor for mite feeding is excessive nitrogen nutrition, which makes plant tissues looser. Furthermore, crop vulnerability often depends on agronomic practices, as mites are prone to developing resistance rapidly.
A variety's resistance to spider mites is determined by morphological features, such as leaf blade density or the presence of trichomes, as well as biochemical characteristics. No unified international coding system for such resistance exists; therefore, in descriptions, it is usually assessed qualitatively as "tolerance" or "relative resistance." When selecting a variety, it is recommended to clarify the evaluation methodology, including the conditions of field trials or artificial infestation.
Selection based on the description text, not official resistance ratings: such data is not available in registers. Mention indicates that the trait is discussed in the variety's sources; see the variety's profile for details on what is specifically stated.
Trifolium resupinatum L. · Persian clover
SOUTH AUSTRALIAN SEED GROWERS CO-OPERATIVE LTD
Rubus idaeus L. · Red raspberry
The James Hutton Institute, Dundee, DD2 5DA
Vitis vinifera L. · Common grape vine
NO DECLARADOS
Fragaria L. · Strawberry
INSTITUTE OF HORTICULTURAL
Cucumis sativus L. · Cucumber
Royal Sluis Vegetables BV (NL)
Malus domestica (Suckow) Borkh. · Apple
Prof. Dr. Christa Fischer
Rubus idaeus L. · Red raspberry
Orzel Agnieszka
Rubus idaeus L. · Red raspberry
Ioriatti Diego
Corylus avellana L. · Common hazel
Shawn A. Mehlenbacher, David C. Smith, Rebecca L. McCluskey
Glycine max (L.) Merr. · Soybean
Seed-Link Inc.
Ribes nigrum L. · Blackcurrant
Research Institute of Horticulture (Instytut Ogrodnictwa) / Research Institute of Horticulture (Instytut Ogrodnictwa)
Rubus L. · Blackberry
Sills Gavin R. / Pabon Andrea M. / Moyles Stephen B.
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
Stewart Philip J.|Watsonville, CA, US / Madesko Martin P.|Aptos, CA, US / Coss JoAnne F.|Pebble Beach, CA, US / Mowrey Bruce D.|Watsonville, CA, US
Impatiens walleriana Hook. f. · Busy Lizzie
Uchneat Michael S.
Guzmania Ruiz et Pav. · Guzmania
Nicolaas D.M. Steur^^^Elly Bak
Impatiens New Guinea Group · New Guinea Impatiens
SATO CHIHIRO|MINEMURA SHINJI
Fragaria x ananassa Duchesne ex Rozier · Garden strawberry
PHUONG NGUYEN, MICHAEL D FERGUSON
Rubus idaeus L. · Red raspberry
NIELS ARTS
Malus Mill. · Apple
Murawski en Fischer
Chrysanthemum L. · Chrysanthemum
Vandenberg Cornelis P
Solanum lycopersicum L. · Tomato
ZERAIM GEDERA
Corylus avellana L. · Common hazel
Shawn A. Mehlenbacher, Rebecca L. McCuskey, David C. Smnit
Malus domestica (Suckow) Borkh. · Apple
Prof. Dr. Manfred Fischer / Heinz Murawski + im Institut für Obstforschung Dresden-Pillnitz / Prof. Dr. Christa Fischer
Ribes nigrum L. · Blackcurrant
Instytut Ogrodnictwa, PL